"Já ho za dobrého otce nepovažuju."

[btopps]

How exactly is "za" translated here?

[VladaFu]

You cannot translate every word. Different verbs have different kind of valences in different languages. "to consider somebody something" is "považovat někoho za něco". It is just a preposition used with the verb.

[ken55414]

In this case, does "za" require accusative or genitive?

[VladaFu]

accusative, genitive would be něčeho, not něco

[Kat961424]

Very narrow definition of what's considered "right"
"I don't think he is a good father" is just as correct in an intonationally neutral context

[VladaFu]

But that is a translation of "Myslím, že je dobrý otec.". We must require to stay as close as possible to the original or the number of possible translations would be immense.